Graduation Term
2015
Degree Name
Master of Science (MS)
Department
Department of Chemistry
Committee Chair
Timothy A. Mitchell
Abstract
Oxidopyrylium-based [5+2] cycloadditions have been extensively utilized to construct oxabridged seven-membered ring systems that often serve as the core structures in numerous biologically active natural products. By investigating these processes, we hope to reveal the highest potentials of [5+2] cycloaddition as a synthetic tool.
A novel oxidopyrylium-alkene [5+2] cycloaddition conjugate addition cascade (C3) sequence, which allows rapid build-up of molecular complexity with excellent diastereocontrol, was investigated. The scope and limitation of this process were explored as mixed results were shown for various acetoxypyranone-alkene substrates. In addition, oxidopyrylium [5+2] cycloadditions of ï?¢-silyloxy-ï?§-pyrones were investigated which revealed the accelerating role of carbonyl substituents at the trans-terminal position of alkenes. Finally, we have demonstrated the utility of sulfinimine chiral auxiliary in the asymmetric [5+2] cycloaddition of ï?¢-silyloxy-ï?§-pyrones.
Access Type
Thesis-Open Access
Recommended Citation
Law, Chunyin Marshall, "Investigation of Oxidopyrylium-Alkene [ 5 +2 ] Cycloaddition Conjugate Addition Cascades and Extension to Chiral Auxiliary-Based Variants" (2015). Theses and Dissertations. 450.
https://ir.library.illinoisstate.edu/etd/450
DOI
http://doi.org/10.30707/ETD2015.Law.C